Don't think it's pennywort - the edges of the leaves aren't crinkled,
the stems are thinner, and the leaves themselves look less thick and
glossy. I suppose a taste-test might help...

--
www.gastronomydomine.com

http://www.coopext.colostate.edu/TRA...esaplants.html

There's a picture of mountain sorrel about halfway down this page.

--
www.gastronomydomine.com